Single-blow tubular-rivet header



' Oct. 8, l29. 4 F. J. St PIERRE 1,730,954

SIIGLE BLOW TUBULAR RIVET HEADER Fi led July 2, 1928 i 14* ,w if 1 0INVENTOR jorhuza J St. Pierre fab ATTORNE;

Patented Oct. 8, 1929 UNITED STATES FORTUNA J". ST. PIERRE, F WOODBURY,CONNECTICUT SINGLE-BLOW TUBULAR-RIVET HEADER Application filed July 2,1928.

This invention relates to machines for making tubular rivets from solidwire blanks, and more particularly to a machine of this nature whichwill produce such a rivet on each stroke thereof.

The objects of this invention are to provide a rivet heading machine ofthe above nature which will be simple in construction, ineX pensive tomanufacture, easy to install and manipulate, and very efficient anddurable in use.

With these and other objects in view there have been illustrated on theaccompanying drawings two forms in which the invention may beconveniently embodied in practice.

Fig; 1 represents a longitudinal sectional view of the rivet punch anddie-holding block as they appear at the commencement of the operation offorming the tubular shank.

Fig. 2 is a sectional view similar to Fig. 1 showing the parts as theyappear just after the formation of said tubular shank.

Fig. 3 is a view similar to Figs. 1 and 2 showing the parts as theyappear after the upsetting of the rivet head and before the rivet hasbeen ejected.

Fig. 4 is a side view partly in section of the tubular rivet produced bythe machine shown in Figs. 1 to 3.

Figs. 5 and 6 are perspective ,views respectively of a modified form ofsplit rivet and rod member for splitting the shank thereof.

In the manufacture of bolts and rivets having tubular shanks it has beencustomary in the past to upset the head in one machine and to drill inthe shank in a separate machine.

By means of the present invention a single machine has been providedwhich will perform both of the above-mentioned operations at a singlestroke of a punch. This has been accomplished by holding the rivet shankwithin a tubular passage in the punch and forcing a reduced pinthereunto prior to the upsetting of the head on the other end of therivet blank.

According to former methods of making tubular rivets it generallyrequired three drilling machines to feed a sufiicient number of tubularblanks to keep up with the produc- 50 tion of, a single rivet header.The present Serial No. 289,702.

invention eliminates all drilling operations and consequently results ina substantial sav ing in labor and drill expense.

Referring now to the drawings in which like reference numerals denotecorresponding parts throughout the several views, the numeral 10indicates a portion of the reciprocating gate member of a rivet headingmachine, said gate member having a horizontal cylindrical punch-holdingrecess 11 and a small knockout passage 12 communicating with said recess11 for receiving a knock out pin 13. Fitted within the recess 11 is acup-shaped sleeve member 14 having its open inner end 15 in contact withthe base of said recess, the outer closed end of said sleeve member 14having a central circular aperture 16 for fitting over a slidable rivetpunch 17. The

punch 17 is provided intermediate its ends with a flange 18 adapted tofit within the interior of the cup-shaped sleeve member 14, said punchhaving a reduced rear end 19 surrounding which is a coiled spring 20.The spring 20 has one end in contact with the flange 18 and its otherend engages a washer 21 seated on the bottom of'the recess 11.

The washer 21 is provided with a central stepped aperture 22 in its basethe enlarged portion of said stepped aperture forming a seat for a head23 of a rod member 24, the latter being adapted to slide within atubular passage in the interior of the punch 17 and having a slightlytapered reduced shankpiercing pin 25 on its outer end.

In order to upset the head upon the rivet,

I provision is made of a cylindrical anvil member 26 located within astationary die block 27. The anvil member 26 has a spherical recess 28in its outer face in alinement with the rod member 24.

In' operation, after a wire blank 29 has been inserted into the tubularpassage in the punch 17 the gate member will be moved to the left asshown in Fig. 1 by the usual mechanism, not shown. The pin 25 on the endof the rod member 24 will then come into engagement with the inner endof the wire blank 29 and will force said blank ahead of it until itsouter end rests in the spherical heading recess 28 in the anvil 26. Asthe gate continues to move to the left, the pin 25 will be forced intothe shank of the wire blank 29, the head 23 of the rod member 24 beingfirmly seated in the bottom of the gate recess 11.

As the gate continues to move toward the left, the punch 17 will slideinto the sleeve member 14: against the compression of the spring 20until the reduced section 19 of said punch strikes the washer 21 in thebottom of the recess 11. The outer endof the wire blank 29 will then beforced into the heading recess 28 and will be upset to form the head 30of the rivet, the completed rivet being shown in Fig. 4. On the returnmovement of the gate 10 the completed rivet will be thrown out of thepunch 18 by the ejector 13.

Fig. 5 represents a modified form of rivet having a split shank 30 whichmay be produced in the same machine merely by substituting a rod member31 having a wedgeshaped end 32 for the rod member 24 previouslydescribed. It will be understood, however, that the application of themachine is not limited to the production of the rivets shown in Figs. 4and 5, but various other forms may be made therein using other suitableheading tools, within the spirit of the invention.

IVhile there have been disclosed in this specification two forms inwhich the invention may be embodied, it is to be understood that theseforms are shown for the purpose of illustration only, and that theinvention is not to be limited to the specific disclosures but I may bemodified and embodied in various other forms without departing from itsspirit. In short, the invention includes all the modifications andembodiments coming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new, andfor which it is desired to secure Letters Patent, is:

1. In a machine for producing a tubular rivet. a stationary die blockcontaining a recess for upsetting the head of the rivet, a reciprocatinggate member, a spring-pressed punch slidably mounted in said gatemember, said punch having an interior bore titting about the shank ofsaid rivet, and a rod member in said bore having one end seated in saidgate, the other end of said rod having a reduced pin for piercing a holein said shank prior to the upsetting of said head, said rod member beingshorter than said punch whereby the rivet shank will remain in saidpunch during the piercing operation.

2. In a machine for producing a hollow rivet. a stationary die blockcontaining a recess for upsetting the head of the rivet, a reciprocatinggate member, a. spring-pressed punch slidably mounted in said gatemember, said punch having an interior bore fitting about the shank ofsaid rivet, and a rod member in said bore having one end seated in saidgate. the other end of said rod having a reduced section for piercing ahole in said shank prior to the upsetting of said head, said punch beingsurrounded by a cup-shaped retaining sleeve carried by said gate member,said rod member being shorter than said punch whereby the rivet shankwill remain in said punch during the piercing operation.

3. In a machine for producing a hollow rivet, a stationary die blockcontaining a recess for upsetting the head of the rivet, 'areciprocating gate member, av spring-pressed punch slidably mounted insaid gate mem her, said punch having. an interior bore fitting about theshank of said rivet, and a rod 1 member in said bore having one endseated in said gate, the other end of said rod having a reduced sectionfor piercing a hole in said shank prior to the upsetting of said head,said punch being surrounded by a cup-shaped retaining sleeve carried bysaid gate member, said sleeve having an inturned edge, said punch havingan intermediate flange adapted to engage the inturned edge of saidsleeve for locking said punch in said gate, said rod member beingshorter than said punch whereby the rivet shank will remain in saidpunch during the piercing operation.

I 4. In a machine for producing a tubular rivet, a reciprocating gatemember, a stationary recessed die for upsetting the head of a rivet,apunch slidably mounted in said gate member, a helical spring in saidgate member surrounding and cushioning said punch, means in the interiorof said punch for piercing a socket in the. shank of said rivet prior tothe upsetting of the head and on the same stroke of the punch.

5. In a machine for producing a tubular rivet, a reciprocating gatemember, a stationary recessed die for upsetting the head of a rivet, apunch slidably mounted in said gate member, a helical spring in saidgate member surrounding and cushioning said punch, a rod member in theinterior of said punch for piercing a socket in the shank of said rivetprior to the upsetting of the head and 011 the same stroke of the punch,said rod member being shorter than said punch whereby the rivet shankwill remain in said punch during the piercing operation.

6. In a machine for producing a. tubular rivet, a reciprocating gatemember, a stationary recessed die for upsetting the head of a rivet, apunch slidably mounted in said gate member, a helical spring in saidgate member surrounding and cushioning said punch, a rod member in theinterior of said punch for piercing a socket in the shank of said rivetprior to the upsetting of the head and on the same stroke of the punch,and means in said gate member for locking the'base of said rod member,said rod member being shorter than said punch whereby the rivet shankwill reinain in said punch during the piercing operaion.

7. In a machine for producing arivet having a hollow shank from a solidwire blank, a stationary die for upsetting the head of a rivet, areciprocating gate member having a recess, a washer in the base of saidrecess, a hollow punch slidable in said recess, the bore of said punchfitting the shank of said blank, a rod member located in said bore andhaving a head locked in said washer, and means for ejecting said punchand rod member, said rod member being, shorter than said punch wherebythe rivet shank will remain in said punchduring the piercing operation.

In testimony whereof, I have affixed my signature to this specification.

FORTUN A J. ST. PIERRE.

